Troubleshooting
If the chiller-heater has any problems or an abnormal condition is detected while it operates, find
the cause. Use the following procedures listed to fix the problem.
If the cause is not clear, using the countermeasure cannot repair the problem, or if the chiller-
heater seems to have a serious problem, contact your local Johnson Controls Service Center
immediately.
If the chiller-heater stops because of a malfunction, wait until the chilled/hot water pump, cooling
water pump, and chiller-heater unit stop completely, then verify the following items.
Causes of lighting of trouble indicator lamps on control panel of absorption chiller-heater and
countermeasures against them.
Several items must be checked routinely whenever the chiller-heater experiences any trouble or
abnormality.
• Check to see if the main fuel gas valve was closed by mistake.
• Open the main valve.
• See if the valves of the chilled/hot system and cooling water system are set correctly. Verify the
flow rate.
• See if the cooling tower is operating normally.
• Check the valves and pumps of the cooling water system. Verify the flow rate.
Contact your local Johnson Controls Service Center if any of the following apply:
• The water flow rate setting is unknown.
• It takes 30 minutes or more to restore operations.
• Solution is crystallized.
• The cause of the trouble is not readily apparent.
Note:
Check the causes in order. Any of these causes will state the diluting operation
automatically then stop the chiller-heater. Check that the diluting operation was completed,
and if not, dilute the solution according to the
Manual refrigerant blow down and diluting
.
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Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
